Malware spreading over the Skype network Tuesday raised flags across the internet. Websense has since posted a reclassification of the threat as a Trojan horse and its overall impact is declining.

Websense was among the first to post an alert about a possible Skype worm. However, after talking with the Skype security team, which is based in Estonia, Hubbard said he had reclassified the threat as a Trojan horse. "A user with Skype will get a message to download a program from a URL included in a chat message," says Hubbard. "If they click on that, a program runs in the background, then injects itself into the Explorer process. It looks like the Trojan is designed to grab forms and passwords from the browser."

"This is either spreading very slowly, and only regionally, or it's dead by now," Hubbard says.